DOI Crawler report

Crossref tests a broad sample of DOIs to ensure resolution. For each journal crawled, a sample of DOIs that equals 5% of the total DOIs for the journal up to a maximum of 50 DOIs is selected. The selected DOIs span prefixes and issues.

The results are recorded in Crawler reports, which are accessed from the Depositor Report expanded view. If a title has been crawled, the last crawl date is shown in the appropriate column. Crawled DOIs that generate errors will appear as a bold link:

Select the 'Last Crawl Date' link to view a Crawler Status Report for a title:

The Crawler Status Report lists the following:

Total DOIs: Total number of DOI names for the title in system on last crawl date

Checked: number of DOIs crawled

Confirmed: crawler found both DOI and article title on response page

Semi-confirmed: crawler found either DOI or article title on response page

Not Confirmed: crawler did not find DOI or article title on response page

Bad: page contains known phrases indicating article is not available (for example: article not found, no longer available)